<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta http-equiv="X-UA-Compatible" content="IE=edge">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>Document</title>
</head>
<body>
  <script>
    var arr = [{label:'男',value: 1}, {label:'女',value: 0}]
 
 function f(arr) {
   // 写代码，得到
   return arr.map(item=>item.label)
  
 }
 var arr2 = f(arr);
 console.log(arr2)
 // arr2 = ['男', '女']
  </script>
</body>
</html>